That is the point though. This is not something magical that will make resized images look crisp. If it looks like crap on normal display it is going to look like crap on a retina display.
BUT
If it looks good on a normal display it is going to look good on a retina display.

Where things get interesting is when the software takes advantages of the retina display to use those extra tiiiny pixels for things like font smoothing and UI elements. Or even games. Who needs antialiasing if your game supports this retina setup?